scholarly journals Bruce Merrifield centennial: pioneer of chemical synthesis on solid matrix

2021 ◽  
Vol 32 (5) ◽  
pp. 2083-2086
Author(s):  
Istvan Hargittai
Keyword(s):  
Chemical Synthesis ◽  
Nobel Prize ◽  
Efficient Technique ◽  
Solid Matrix ◽  
Rockefeller Institute ◽  
Hundredth Anniversary ◽  
Highly Efficient ◽  
Low Profile ◽  
The One

AbstractBruce Merrifield (1921‒2006) was an American biochemist who, at the Rockefeller Institute, invented a highly efficient technique for producing peptides and proteins in the early 1960s. He was awarded the Nobel Prize in Chemistry in 1984. We remember this highly original, low-profile contributor to chemistry on the occasion of the one hundredth anniversary of his birth.

A highly efficient and green approach for the synthesis of pyrimido[4,5-b]quinolines using N,N-diethyl-N-sulfoethanaminium chloride

2021 ◽  
Vol 76 (2) ◽  
pp. 85-90
Author(s):  
Abdolkarim Zare ◽  
Manije Dianat
Keyword(s):  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Catalyst Amount ◽  
Green Protocol ◽  
Highly Efficient ◽  
Green Approach ◽  
Solvent Free Conditions ◽  
The One ◽  
High Yields

Abstract A highly efficient and green protocol for the synthesis of pyrimido[4,5-b]quinolines has been described. The one-pot multicomponent reaction of dimedone with arylaldehydes and 6-amino-1,3-dimethyluracil in the presence of N,N-diethyl-N-sulfoethanaminium chloride ([Et3N–SO3H][Cl]) as an ionic liquid (IL) catalyst under solvent-free conditions afforded the mentioned compounds in high yields and short reaction times. Our protocol is superior to many of the reported protocols in terms of two or more of these factors: the reaction times, yields, conditions (solvent-free versus usage of organic solvents), temperature and catalyst amount.

scholarly journals A Review on the Development of Rotman Lens Antenna

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Shruti Vashist ◽  
M. K. Soni ◽  
P. K. Singhal
Keyword(s):  
High Performance ◽  
Beam Steering ◽  
Phase Error ◽  
Antenna System ◽  
Surveillance Systems ◽  
Electronic Warfare ◽  
Design Concepts ◽  
Low Profile ◽  
True Time ◽  
The One

Rotman lenses are the beguiling devices used by the beamforming networks (BFNs). These lenses are generally used in the radar surveillance systems to see targets in multiple directions due to its multibeam capability without physically moving the antenna system. Now a days these lenses are being integrated into many radars and electronic warfare systems around the world. The antenna should be capable of producing multiple beams which can be steered without changing the orientation of the antenna. Microwave lenses are the one who support low-phase error, wideband, and wide-angle scanning. They are the true time delay (TTD) devices producing frequency independent beam steering. The emerging printed lenses in recent years have facilitated the advancement of designing high performance but low-profile, light-weight, and small-size and networks (BFNs). This paper will review and analyze various design concepts used over the years to improve the scanning capability of the lens developed by various researchers.

Quantum Diplomacy, German–US Relations and the Psychogeography of Berlin

2011 ◽  
Vol 6 (3-4) ◽  
pp. 373-392 ◽  
Author(s):  
James Der Derian
Keyword(s):  
Thought Experiment ◽  
Ronald Reagan ◽  
Global Media ◽  
Hundredth Anniversary ◽  
The One

This article is inspired by a series of events that took place in February 2011 around the effort to negotiate a memorial in Berlin on the occasion of the one-hundredth anniversary of the birth of President Ronald Reagan. A thought experiment with images is constructed to consider whether these events — produced by the ubiquity, interconnectivity and reflexivity of global media — are symptomatic of a new quantum diplomacy.

Chemical Synthesis of Ascorbyl Palmitate in [BMIM]BF4

2011 ◽  
Vol 236-238 ◽  
pp. 1962-1965 ◽  
Author(s):  
Jun Min Ji
Keyword(s):  
Ascorbic Acid ◽  
Ionic Liquid ◽  
Sulfuric Acid ◽  
Chemical Synthesis ◽  
Palmitic Acid ◽  
Ascorbyl Palmitate ◽  
Highly Efficient ◽  
Concentrated Sulfuric Acid

Scorbyl palmitate is a safty and highly efficient lipophilic antioxidant.It is produced by a novel ionic liquid method: L-ascorbic acid was esterified with palmitic acid to synthesize ascorbyl palmitate,using concentrated sulfuric acid as chemical catalyst in 1-Butyl-3-methy limidazolium terafluoroborate ([BMIM]BF4).The yield of ascorbyl palmitate reached 69.6±1%.

Intermetallic Ni2Si/SiCN as a highly efficient catalyst for the one-pot tandem synthesis of imines and secondary amines

2020 ◽  
Vol 7 (1) ◽  
pp. 82-90 ◽  
Author(s):  
Xiao Chen ◽  
Shuhua Han ◽  
Dongdong Yin ◽  
Changhai Liang
Keyword(s):  
High Activity ◽  
Aromatic Amine ◽  
Reductive Amination ◽  
High Selectivity ◽  
Secondary Amines ◽  
One Pot ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
The One ◽  
Tandem Synthesis

For the one-pot reductive amination of benzaldehyde with nitrobenzene, intermetallic Ni2Si/SiCN from the decomposition of a nickel-modified polysilazane precursor exhibited high activity (>99%) and high selectivity (92% to aromatic amine).

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